Unsuccessfully experiment with paritial

[michaeldiamant]

Snapshots an unsuccessful attempt to use functools.partial as an alternative to #335.

Since the approach doesn't appear to work, I'm opening + closing the PR for illustrative purposes.

• Based on the ~30min I spent here, it seems partial functions added outside of a class is less well supported. Or at least I don't quite grok how to do it.
• I attempted several variations on what's shown here. I think the crux of the problem is capturing the cls instance when outside the scope of the referred-to-class.

Since partial function application didn't work as intended, I also spent a few minutes considering a monkey patching solution to preserve invoking a method against DryrunExecutor. That also didn't exactly pan out and I ended up aborting.

I suspect there is a path here. Though I felt it was taking longer than warranted for the problem at-hand. I plan to reconsider the topic over time.